Industrial Waste Air Model (IWAIR)
Industrial Waste Air Model (IWAIR)
- Background Information
- Download Model Files and User's Guide
- User's Guide
- Technical Background Document
- Regional Approaches to Improving Air Quality
EPA developed IWAIR to assist facility managers and regulatory agency staff in evaluating inhalation risks. Workers and residents in the vicinity of a unit may be exposed to volatile chemicals from the unit in the air they breathe. Exposure to some of these chemicals at sufficient concentrations may cause a variety of cancer and noncancer health effects (such as developmental effects in a fetus or neurological effects in an adult). With a limited amount of site-specific information, IWAIR can estimate whether specific wastes or waste management practices may pose an unacceptable risk to human health.
IWAIR is an interactive computer program with three main components:
- An emission model to estimate release of constituents from waste management units (WMUs);
- A dispersion model to estimate fate and transport of constituents through the atmosphere and determine ambient air concentrations at specified receptor locations; and
- A risk model to calculate either the risk to exposed individuals or waste constituent concentrations that can be protectively managed in the unit.
The program requires only a limited amount of site-specific information, including facility location, WMU characteristics, waste characteristics, and receptor information.
To install and run IWAIR, download the iwair.exe file below to your hard drive and double-click. You will be prompted for a directory to which the files should be extracted. Once complete, go to the directory you specified and double-click the setup.exe file.
iwair.exe (Executable ZIP file, 18MB)
For a more in-depth discussion of inhalation risks, refer to Chapter 5 of the Guide.
Due to the large file size of the IWAIR User's Guide, it has been broken up into separate files, listed below.
You will need Adobe Reader to view some of the files on this page. See EPA's PDF page to learn more.
- Table of Contents and Introduction (PDF) (18 pages, 61 KB)
- Getting Started (PDF) (11 pages, 82 KB)
- Selecting Calculation Method, WMU Type, and Modeling Pathway (PDF) (7 pages, 38 KB)
- Completing Risk/Hazard Quotient Calculations (PDF) (33 pages, 554 KB)
- Completing Allowable Waste Concentration Calculations (PDF) (32 pages, 463 KB)
- Example Calculations (PDF) (8 pages, 120 KB)
- References (PDF) (1 page, 15 KB)
- Appendix A: Considering Risks from Indirect Pathways (PDF) (13 pages, 438 KB)
- Appendix B: Parameter Guidance (PDF) (38 pages, 187 KB)
- Appendix C: Physical-Chemical Property Values (PDF) (4 pages, 30 KB)
Due to the large file size of the IWAIR Technical Background Document, it has been broken up into separate files, listed below.
- Table of Contents and Introduction (PDF) (16 pp, 45 KB)
- Source Emission Estimates Using CHEMDAT8 (PDF) (50 pp, 358 KB)
- Development of Dispersion Factors Using ISCST3 (PDF) (15 pp, 285 KB)
- Exposure Factors (PDF) (6 pages, 23 KB)
- Inhalation Health Benchmarks (PDF) (12 pp, 71 KB)
- Calculation of Risk or Allowable Waste Concentration (PDF) (9 pp, 154 KB)
- References (PDF) (1 pp, 21 KB)
- Appendix A: Considering Risks from Indirect Pathways (PDF) (13 pp, 446 KB)
- Appendix B: Physical-Chemical Properties for Chemicals Included in IWAIR Adobe PDF (100 pp, 313 KB)
- Appendix C: Sensitivity Analysis of ISCST3 Air Dispersion Model (PDF) (25 pp, 110 KB)
- Appendix D: Selection of Meteorological Stations, Part 1 (PDF) (14 pp, 1 MB)
- Appendix D: Selection of Meteorological Stations, Part 2 (PDF) (29 pp, 990 KB)
Due to the large file size of this document, it has been broken up into separate files, listed below.
- Regional Approaches to Improving Air Quality, 1 of 3 (PDF) (5 pages, 1.3MB)
- Regional Approaches to Improving Air Quality, 2 of 3 (PDF) (5 pages, 1.0MB)
- Regional Approaches to Improving Air Quality, 3 of 3 (PDF) (5 pages, 870KB)